Sewing-machine.



C. F. GRAY.

SEWING MACHINE.

ArrLxoA'rIoN Hmm 111111124, 1910,

1,000,797. Patented Aug. 15,1911.

INVNTOR (zar/es f n B' ATTRNE Y WINESSES:

UNITED STATES PATENT OFFICE.

CHARLES FREDERICK GRAY, OF SIERRA MADRE, CALIFORNIA, ASSIGNOR T0 THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Application led .Tune 24, 1910. Serial No. 568,604.

T 0 all whom tt may concern:

Be it known that I, CHARLES F. GRAY, a citizen of the United States, residing at Sierra Madre, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to iinprove that class of sewing machines wherein a circularly moving loop-taker engages a loop of needle thread and, without passing through it, casts said loop about a cop or bobbin of under thread which is held in a non-rotatable bobbin-case provided with an annular projection, said bobbin-case being mounted in an annular groove in the inner wall of the flange forming the cast-off port-ion of the loop-taker, as is represented by U. S. patent to W. F. Dial, No. 480,181, dated August 2, 1892, and the present description will be coniined as much as possible to the new parts employed.

In earlier devices of the character above referred to, it has been the common practice to provide the bobbin-case with a stop located slightly at one side of the line of needle actuation, its free end terminating within the limit of downward movement of the needle, and to secure to the frame or bed-plate of the sewing machine a coacting stop for restraining the bobbin-case against accidental axial movement due to its fric tional contact with the groove formed in the loop-taker flange, in which form of construction there is necessarily a substantial resistance to the passage of the needle thread loop between the adjoining walls of said stops as it is withdrawn by the action of the take-up.

To better adapt the stitch-forming mechanism of the class hereinbefore referred to, to the employment of inferior sewing threads in connection with high speed sewing machines, applicant has provided coacting bobbin-case stops which are arranged and automatically controlled to insure the free.

passage of the thread loop between them when said loop is drawn into the seam formation by the action of the needle thread take-up.

For convenience, that portion of the stitchforming mechanism which is located below the upper plane of the sewing machine bedplate will be herein referred to as the under stitch-forming mechanism.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a view in perspective of the front end portion of the bed-plate of a sewing machine provided with a preferred form of under stitch-forming mechanism equipped with the invention, together with the eyepointed needle, a portion of the needle-carrying bar, the cloth-presser, and a portion of the cloth-presser-carrying bar, that portion of the invention comprising the controlling mechanism beingl shown adjusted to its position for holding the stops located above the mass of bobbin or under thread separated for the passage of the thread loop. Fig. 2 is a perspective similar to Fig. 1, representing the bobbin-case stop controlling mechanism adjusted out of operative relationship with the stop element located below the mass of under thread. Fig. 3 shows details of the means for automatically controlling the bobbin-case stop elements with respect to their coacting stationary elements. Fig. 11 is a view in perspective of the bobbin which is normally held within the bobbin-case.

1 represents the sewing machine bed-plate, 2 t-he eye-pointed needle, 3 the needle-carrying bar, 1 the cloth-presser, 5 the clothpresser-carrying bar, 6 the throat-plate suitably secured to the sewing machine bedplate, 7 the loop-taker secured upon the forward end of the loop-taker-actuatin shaft 8 which in turn is mounted irl-suitab e bearings formed in lugs 9 (one only of which is shown, the other being located at the opposite end of the bed-plate) depending from the underside of said bed-plate.

10 represents the bobbin upon which is wound the mass of under thread 34, 11 the bobbin-case, and 12 the bobbin-case cover which is secured against accidental displacement by the latch 13, the latter coacting with a suitable groove (not shown) formed in the free end of the bobbin spindle 14.- secured in said bobbin-case.

All of the foregoing parts are similar in machines of the class first referred to, and are herein shown not as part of the present invention but to better illustrate its application.

From an inspection of the prior art, as represented by the patent previously referred to, it will be readily understood that the stop 15 carried by the bobbin-case 11 is an element common to means for restraining the bobbin-case against rotation, but in the improved mechanism the bobbin-case is also provided with a second stop 16 which in the operation of the stitch-forming mechanism coacts with a statioijiary stop 17 comprising the lower' free end of the bracket 18, which latter is secured by screw 19 and pin 20 to a lug 21 depending from the sewing machine bed-plate.

To effect the required opening between the abutting walls of the elements 16 and 17 for the passage of the thread loop about the bobbin-case, there is secured upon the looptaker-actuating shaft 8 an eccentric 22 provided with an eccentric strap 23, the opposite end of which latter is pivotally connected with an arm 24 carried by a hollow shaft 25. The shaft 25 is mounted to oscillate on a shaft 26 having a central opening 26 for the purpose of lubrication and extending out from the lug 9 located near the front end of the bed-plate, said hollow shaft carrying at its outer end a finger 27, the free end 28 of which coacts at times with the element 15 to axially move the bobbincase in the direction opposite to that of the stitch-forming movements of the loop-taker.

29 represents a screw for securmg the shaft 26 in the lug 9 located near the front end of and formed integral with the sewing machine bed-plate, and 30 a screw for securing the finger 27 to a short arm 31 (shown in dotted lines only, Fig. 3) formed integral with the hollow shaft 25, the end 32 of said finger having an opening into which the outer end of said hollow shaft extends as shown by dotted lines 32.

The bracket 18 is provided with a second stop 33 which comprises the upper free end of said bracket and may or may not be employed, as it is functionless except to restrain the bobbin-case against turning when, for any purpose, the loop-taker is manually turned in the direction opposite to that of its stitch-forming movements.

lIn the operation of the device, as the thread 35 forming the loop reaches the posit-ion illustrated in Fig. 2, the eccentric 22, through the connections previously point-ed out, causes the end 28 of the linger 27 to contactwith the stop 15 and move the stop 16 out of engagement with the stationary stop 17. In the further rotation of the shaft 8 the movement of the finger 27 is reversed, and owing t-o the frictional contact between the bobbin-case and the looptaker, the stop 16 is again moved in contact with the stop 17, thus positioning the stop 15 out of contact with the oppositely arranged elements 28 and 33, permitting the thread comprising the loop to pass freely on opposite sides of the stop 15, as shown in Fig. 1, which mode of operation is rcpeated for each successive stitch formation.

Claims 1. In a sewing machine, a loop-taker, a non-rotatable bobbin-case mounted in said loop-taker, means including a loop-takeractuating shaft for causing said loop-taker to cast the needle thread loop about said bobbin-case, a stationary .bobbin-case stop located on the non-loop-seizing side of the diameter of said liibbin-case arranged transverse to the line of needle actuation, multiple stops carried by said bobbin-case, and connections between one of the stops carried by the bobbin-case and the loop-taker-actuating shaft for giving to said bobbin-case axial movements in the direction opposite to that of the stitch-forming movements of said loop-taker to effect an unobstructed passage for the thread loop about said bobbin-case.

2. In a sewing machine, a loop-taker, a non-rotatable bobbin-case mounted in said loop-taker, means including a loop-takeractuating shaft for causing said loop-taker to cast the needle thread loop about said bobbin-case, stationary bobbin-case stops one of which is located at one side and the other at the opposite side of the diameter of the bobbin-case arranged transverse to the line of needle actuation, multiple stops carried by said bobbin-case, and connections between one of the stops carried by the bobbin-case and the loop-taker-actuating shaft for giving to said bobbin-case axial movements in the direction opposite to that of the stitclrforming movements of said loop-taker to effect an unobstructed passage for the thread loop about said bobbin-case.

3. In a sewing machine, a loop-taker, a nonsrotatable bobbin-case mounted in said loop-taker, means including a loop-takeractuating shaft for causing said loop-taker to cast the needle thread loop about said bobbin-case, a stationary bobbin-case stop located on the non-loop-seizing side of the diameter of said bobbin-case arranged transverse to the line of needle actuation, multiple stops carried by said bobbin-case, and connections between one of said stops carried by said bobbin-case and said looptal er-actuating shaft, including an eccentric carried by said shaft, for giving to said bobbin-case axial movements in the direct-ion opposite to that of the stitch-forming movements of said loop-taker to eect an unobstructed passage for the thread loop about said bobbin-case- 4. In a sewing machine, a loop-taker, a non-rotatable bobbin-case mounted in said loop-taker and provided with vertically arranged stops located one at the upper and the other at the lower periphery of said bobbin-case, means including a loop-takeractuat-ing shaft for causing said loop-taker to cast the loop of needle thread about said bobbin-case, multiple bobbin-case stops mounted upon a stationary portion of the sewing machine and arranged one in hori zontal alinement with the upper stop carried by said bobbin-case and the other in like alinement with the lower stop carried by said bobbin-case, and an oscillating linger operatively connected with said loop-taker actuating shaft, said linger at times acting on t-he upper stop carried by the bobbin-case to release the lower stop carried by said bobbin-case from engagement with its coacting stationary stop to effect an unobstructed passage for the thread loop about the lower periphery of said bobbin-case.

5. In a sewing machine, a loop-taker, a nonrotatable bobbin-case mounted in said loop-taker and provided with vertically arranged stops located one at the upper and the other at the lower periphery of said bobbin-case, means including a loop-takeractuating shaft for causing said loop-taker to cast the loop of needle thread about said bobbin-case, a bobbin-case stop mounted on a stationary portion of the sewing machine and arranged in horizontal alinement with the lower stop carried by said bobbin-case, and an oscillating finger operatively connected with the loop-taker-actuating shaft, said linger at times acting upon the upper stop carried by said bobbin-case to release the lower stop carried by said bobbn-case from engagement with its coacting stationary stop to effect an unobstructed passage of the thread loop about the lower periphery of said bobbin-case.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES FREDERICK GRAY.

Witnesses:

J. D. MACKURAS, A. S. MEAD.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents.

Washington, ID. C. i 

